This is a substitution item to use only when ordering a sail kit or boat and sail kit from us. This item deletes the lateen sail, mast, spars and mast step and substitutes in a Batwing sail from Balogh Sail Designs. Includes substitution of mast, boom, mast step, sail and rigging. To buy these items outright, instead of as a substitution, order item 5008 instead. The Batwing sail can be reefed by means of zippers to reduce sail area in high wind. The high-tech modern design of the sail makes it more efficient for sailing upwind. Across the wind (reaching) it is about equal to our 55 SF lateen sail in a strong wind. In light winds, it is inferior on all points of sail. It shines in winds above 10 mph. Size is 36 SF but performance in strong wind can equal or beat a larger sail, with less healing over of the boat. Note: Batwing sail comes with its own bag (included) for sail and mast and it is about 54 inches long (sail and mast fold to 54 inches). This bag is just for the sail, mast and boom. More info CLICK HERE.